Btrfs: Add back pointers from extents to the btree or file referencing them

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 28 insertions, 10 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d0af0807d9f8..bb70db0c9df4 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -93,7 +93,9 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
         if (alloc_hint == EXTENT_MAP_INLINE)
                 goto out;
 
-        ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0,
+        ret = btrfs_alloc_extent(trans, root, num_bytes,
+                                 root->root_key.objectid, trans->transid,
+                                 inode->i_ino, start, 0,
                                  alloc_hint, (u64)-1, &ins, 1);
         if (ret) {
                 WARN_ON(1);
@@ -560,6 +562,7 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
         u64 extent_start = 0;
         u64 extent_num_bytes = 0;
         u64 item_end = 0;
+        u64 root_gen = 0;
         int found_extent;
         int del_item;
         int extent_type = -1;
@@ -670,6 +673,15 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
                                         found_extent = 1;
                                         inode->i_blocks -= num_dec;
                                 }
+                                if (leaf == root->node) {
+                                        root_gen =
+                                                btrfs_header_generation(leaf);
+                                } else {
+                                        struct extent_buffer *parent;
+                                        parent = path->nodes[1];
+                                        root_gen =
+                                                btrfs_header_generation(parent);
+                                }
                         }
                 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE &&
                            !del_item) {
@@ -690,7 +702,10 @@ delete:
                 btrfs_release_path(root, path);
                 if (found_extent) {
                         ret = btrfs_free_extent(trans, root, extent_start,
-                                                extent_num_bytes, 0);
+                                                extent_num_bytes,
+                                                root->root_key.objectid,
+                                                root_gen, inode->i_ino,
+                                                found_key.offset, 0);
                         BUG_ON(ret);
                 }
         }
@@ -1900,7 +1915,14 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
         trans = btrfs_start_transaction(root, 1);
         BUG_ON(!trans);
 
-        leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0);
+        ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
+                                       0, &objectid);
+        if (ret)
+                goto fail;
+
+        leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
+                                        objectid, trans->transid, 0, 0,
+                                        0, 0);
         if (IS_ERR(leaf))
                 return PTR_ERR(leaf);
 
@@ -1908,7 +1930,8 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
         btrfs_set_header_level(leaf, 0);
         btrfs_set_header_bytenr(leaf, leaf->start);
         btrfs_set_header_generation(leaf, trans->transid);
-        btrfs_set_header_owner(leaf, root->root_key.objectid);
+        btrfs_set_header_owner(leaf, objectid);
+
         write_extent_buffer(leaf, root->fs_info->fsid,
                             (unsigned long)btrfs_header_fsid(leaf),
                             BTRFS_FSID_SIZE);
@@ -1933,11 +1956,6 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
         free_extent_buffer(leaf);
         leaf = NULL;
 
-        ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
-                                       0, &objectid);
-        if (ret)
-                goto fail;
-
         btrfs_set_root_dirid(&root_item, new_dirid);
 
         key.objectid = objectid;
@@ -2056,7 +2074,7 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
         if (ret)
                 goto fail;
 
-        ret = btrfs_inc_root_ref(trans, root);
+        ret = btrfs_inc_root_ref(trans, root, objectid);
         if (ret)
                 goto fail;
 fail: